Question
Which one of the following groupings represents a collection of isoelectronic species? $$\left( {At.\,nos.\,\,:\,Cs:55,\,Br:35} \right)$$
A.
$${N^{3 - }},{F^ - },N{a^ + }$$
B.
$$Be,A{l^{3 + }},C{l^ - }$$
C.
$$C{a^{2 + }},C{s^ + },Br$$
D.
$$N{a^ + },C{a^{2 + }},M{g^{2 + }}$$
Answer :
$${N^{3 - }},{F^ - },N{a^ + }$$
Solution :
$${N^{3 - }},{F^ - }$$ and $$N{a^ + }$$ contain 10 electrons each.